How to Write a WordPress Plugin Series

Devlounge has started an excellent series of articles on how to write WordPress plugins. If you are a web developer with sufficient knowledge of PHP and have been using WordPress then head over there to read it.

For any WordPress user, plugins are essential. WordPress Plugins
allow those with little to no programming skills to extend the
functionality of their blog. Plugins come in all shapes and sizes, and
there is a plugin that does just about anything for WordPress.

As good as WordPress is as a standalone application, there are still
things that WordPress lacks. Users are requesting more and more
features for WordPress that would be very feasible to write as a
plugin. There are many untapped ideas out there, and new ones created
every day.